For $300, are there any confirmed increases in gas mileage overrall with an aftermarket intake? I can understand the "seat of the pants" increase in power, throttle response, etc, but I'm looking for some real numbers. How about confirmed HP increases?

 

Don't expect a mpg increase. You're not likely to find realistic dyno graphs for each application. What you can find will likely be inflated for marketing purposes. Expect about 10HP or so.

 

i saw about a 1/2 mpg increase after i installed my k@N FPK2 I was only able to record a tank of gas with this mod before i threw a flowmaster exaust on my truck and i saw alittle increase in my MPG with that too